### Please describe the problem.

Sometimes `git annex copy` complains with `git-annex: .git/HEAD: openFile: resource busy (file is locked)`. For example:

```
$ git annex copy --from r1 --to r2 --not --in r2
copy dir/foo/bar/baz.txt (from r1...)
(checksum...) (to r2...)
ok
copy dir/quux/buz/bez1.bin (from r1...)
(checksum...) (to r2...)
ok
copy dir/quux/buz/bez2.bin (from r1...)
(checksum...) (to r2...)
ok
copy dir/quux/buz/bez3.bin (from r1...)
(checksum...) (to r2...)
ok
git-annex: .git/HEAD: openFile: resource busy (file is locked)
```

This happens in a `adjusted/master(unlockpresent)` branch.

everything seems to work fine regardless of the complaint, so I don't know if this warning message is just a cosmetic issue or if it is the tip of the iceberg, hiding a more serious problem.

### What version of git-annex are you using? On what operating system?

```
git-annex version: 10.20230329-g30d7f9ad7
build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Benchmark Feeds Testsuite S3 WebDAV
dependency versions: aws-0.22.1 bloomfilter-2.0.1.0 cryptonite-0.29 DAV-1.3.4 feed-1.3.2.1 ghc-9.0.2 http-client-0.7.13.1 persistent-sqlite-2.13.1.0 torrent-10000.1.1 uuid-1.3.15 yesod-1.6.2.1
key/value backends: SHA256E [...] WORM URL X*
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg hook external
operating system: linux x86_64
supported repository versions: 8 9 10
upgrade supported from repository versions: 0 1 2 3 4 5 6 7 8 9 10
local repository version: 8
```

### Please provide any additional information below.

This is probably related to [[bugs/Failed_adjusted_branch_update_after_error_in_drop/]]

> [[fixed|done]] (I presume) --[[Joey]]
